package com.apache.netty.tcp;

import io.netty.buffer.ByteBuf;
import io.netty.buffer.Unpooled;
import io.netty.channel.ChannelHandlerContext;
import io.netty.channel.SimpleChannelInboundHandler;

import java.nio.charset.Charset;
import java.util.UUID;

public class MyServerHandler extends SimpleChannelInboundHandler<ByteBuf> {
  private int count;

  @Override
  public void exceptionCaught(ChannelHandlerContext ctx, Throwable cause) throws Exception {
    cause.printStackTrace();
    ctx.close();
  }

  @Override
  protected void channelRead0(ChannelHandlerContext ctx, ByteBuf msg) throws Exception {

    byte[] buffer = new byte[msg.readableBytes()];
    msg.readBytes(buffer);

    // 将buffer转成字符串
    String message = new String(buffer, Charset.forName("utf-8"));

    System.out.println("服务器接收到数据 " + message);
    System.out.println("服务器接收到消息量=" + (++this.count));

    // 服务器回送数据给客户端, 回送一个随机id ,
    ByteBuf responseByteBuf =
        Unpooled.copiedBuffer(UUID.randomUUID().toString() + " ", Charset.forName("utf-8"));
    ctx.writeAndFlush(responseByteBuf);
  }
}
